1 host blog network

So...

I want to set up a blog network. I have some old domains I can use to start something but I only want to use 1 host.

Now looking into it I can set up a htaccess file that will internally redirect all these domains so that it spoofs the IP and c-block...

This sounds ideal to me, but how is it done?

Is it even possible as it just sounds to nice to be real...

Thanks

Risky,do it right and use seperate hosts.